Astronomy:CY Boötis

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Short description: Star in the constellation Boötes
CY Boötis
Location of CY Boötis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Boötes[1]
Right ascension  14h 17m 28.4519s[2]
Declination +15° 15′ 48.167″[2]
Apparent magnitude (V) 5.74 - 5.90[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M3IIIa[1]
B−V color index 1.678[1]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)−11.30[5] km/s
Proper motion (μ) RA: 14.27[2] mas/yr
Dec.: 8.80[2] mas/yr
Parallax (π)3.3735 ± 0.1766[6] mas
Distance970 ± 50 ly
(300 ± 20 pc)
Absolute magnitude (MV)−0.98[1]
Details
Mass1.2[7] M☉
Radius76.78[6] R☉
Luminosity1,078[8] L☉
Surface gravity (log g)1.35[7] cgs
Temperature3,682[8] K
Metallicity−0.31[7]
Other designations
101 Vir, CY Boötis, NSV 6613, BD+15°2690, GC 19284, HD 125180, HIP 69829, HR 5352, SAO 100956, PPM 130465, TYC 1469-1456-1, GSC 01469-01456, IRAS 14150+1529, 2MASS J14172843+1515478
Database references
SIMBADdata
Data sources:
Hipparcos Catalogue,
Bright Star Catalogue (5th rev. ed.)

CY Boötis (Flamsteed: 101 Virginis) is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch.[4] Its apparent magnitude ranges from 5.74 to 5.9, making it faintly visible to the naked eye under good observing conditions. It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[9][10] John R. Percy found it to be "marginally variable" in 1993.[11] When it was confirmed as a variable star, it was actually within the border of the constellation Boötes and given its name.[12]

The variability is not strongly defined but a primary period of 23 days and a secondary period of 340 days have been reported.[13]

CY Boo is listed in the Hipparcos catalogue as a "problem binary", a star which was suspected of being multiple but for which the Hipparcos observations did not give a satisfactory solution. Further observations have always shown it to be single.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 Samus, N.N.; Kazarovets, E.V.; Durlevich, O.V.; Kireeva, N.N.; Pastukhova, E.N.. "CY Boo". Lomonosov Moscow State University. http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=CY+Boo. 
  4. ↑ 4.0 4.1 Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  5. ↑ Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics 498 (2): 627. doi:10.1051/0004-6361/200810698. Bibcode: 2009A&A...498..627F. 
  6. ↑ 6.0 6.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ 7.0 7.1 7.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ 8.0 8.1 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M. 
  9. ↑ Davies, H. S. (1905). "Flamsteed and Piazzi Identities". Popular Astronomy 13: 423. Bibcode: 1905PA.....13..423D. https://archive.org/details/sim_popular-astronomy_1905-10_13_8/page/423. 
  10. ↑ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 209. doi:10.1177/002182868701800305. Bibcode: 1987JHA....18..209W. 
  11. ↑ Percy, John R. (December 1993). "The Photometric Variability of K Giants". Publications of the Astronomical Society of the Pacific 105: 1422–1426. doi:10.1086/133324. Bibcode: 1993PASP..105.1422P. https://articles.adsabs.harvard.edu/pdf/1993PASP..105.1422P. Retrieved 6 December 2024. 
  12. ↑ Kazarovets, E. V.; Samus, N. N. (April 1997). "The 73rd Name-List of Variable Stars". Information Bulletin on Variable Stars 4471: 1–45. Bibcode: 1997IBVS.4471....1K. https://ibvs.konkoly.hu/pub/ibvs/4401/4471.pdf. Retrieved 6 December 2024. 
  13. ↑ Percy, J. R.; Dunlop, H.; Kassim, L.; Thompson, R. R. (2001). "Periods of 25 Pulsating Red Giants". Information Bulletin on Variable Stars 5041: 1. Bibcode: 2001IBVS.5041....1P. 
  14. ↑ Mason, Brian D.; Martin, Christian; Hartkopf, William I.; Barry, Donald J.; Germain, Marvin E.; Douglass, Geoffrey G.; Worley, Charles E.; Wycoff, Gary L. et al. (1999). "Speckle Interferometry of New and Problem HIPPARCOS Binaries". The Astronomical Journal 117 (4): 1890. doi:10.1086/300823. Bibcode: 1999AJ....117.1890M. 



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